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Ovals to get less water
Children enjoy the Alkimos waterwise playground. Picture: Bill Hatto/The West Australian

The amount of groundwater used to irrigate sporting ovals in new northern suburbs will be cut as the State Government, councils and developers look at ways to cope with WA's booming population and dwindling water supplies.

Residents in new developments such as Alkimos Beach and Eglinton in the City of Wanneroo can also expect to see native plants and bush instead of grassed areas as part of moves to save water.

Water Minister Mia Davies yesterday unveiled the north-west corridor water supply strategy, aimed at providing enough groundwater for household supply and irrigation in new suburbs from Alkimos to north of Two Rocks.

With the region's Gnangara Mound groundwater almost fully allocated, Ms Davies said the Government had to investigate ways to evenly distribute the existing allocation to 9000ha of land earmarked for development.

Ms Davies said while historically Perth's suburban playing fields and parks have had unlimited access to water, reduced rainfall and a growing population meant that was no longer possible.

The standard irrigation rate of 7500 kilolitres per hectare a year, which has applied across Perth for decades, will be reduced to 6750kl in northern corridor developments.

Ms Davies said it would allow for the creation of 37ha of sporting ovals at Alkimos and Eglinton.

Wanneroo mayor Tracey Roberts said playing fields were a key issue.